Physics · Oct / Nov 2022 · Paper 62 · Question 4
0625
As printed in the paper
The question as text
A student investigates the effect on the resistance of a wire when the tension in the wire is increased. The apparatus is shown in Fig. 4.1. The tension in the wire is increased by adding loads to the hook attached to the wire. The student measures the current I in the wire and the potential difference (p.d.) V across the wire. She determines the resistance R of the wire using the equation R = V I . The student takes all the necessary safety precautions. You are not required to write about safety precautions. The following apparatus is available: • resistance wire • power source, connecting wires and crocodile clips • ammeter • voltmeter • selection of loads and a hanger. A floor clamp resistance wire bench crocodile clip pulley hook load hanger load Fig. 4.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
circuit diagram
MP1
voltmeter correctly positioned with correct circuit symbol
method
MP2
attach a load, record / note / check V and I (and the value of the load)
MP3
calculate / measure / record the resistance of the wire
MP4
repeat with at least two other loads
control variable
MP5
distance / length of wire between crocodile clips
table
MP6
columns for load / tension / mass / number of loads, V, I and R with units at the head of each column
conclusion
MP7
compare load with resistance to see if there is an effect / plot graph of load against resistance
NOTE: The principle to apply here is ‘could I draw a significantly better line, using these points, under examination conditions?’ If the answer is definitely ‘yes’, do not award the mark.
NOTE: –
If candidate’s scale consists of actual readings at equal intervals this will produce a perfect straight line. The only mark available in this case is the first (axes right way round and labelled) So maximum 1.
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